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DOI | 10.1007/s00382-017-3661-6 |
Variability and trends of wet season temperature in the Sudano-Sahelian zone and relationships with precipitation | |
Oueslati, Boutheina1; Camberlin, Pierre1; Zoungrana, Joel2; Roucou, Pascal1; Diallo, Saliou1 | |
2018-02-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 50页码:1067-1090 |
文章类型 | Article |
语种 | 英语 |
国家 | France; Guinea Bissau |
英文摘要 | The relationships between precipitation and temperature in the central Sudano-Sahelian belt are investigated by analyzing 50 years (1959-2008) of observed temperature (Tx and Tn) and rainfall variations. At daily time-scale, both Tx and Tn show a marked decrease as a response to rainfall occurrence, with a strongest departure from normal 1 day after the rainfall event (-0.5 to -2.5 A degrees C depending on the month). The cooling is slightly larger when heavy rainfall events (> 5 mm) are considered. The temperature anomalies weaken after the rainfall event, but are still significant several days later. The physical mechanisms accounting for the temperature response to precipitation are analysed. The Tx drop is accounted for by reduced incoming solar radiation associated with increased cloud cover and increased surface evaporation following surface moistening. The effect of evaporation becomes dominant a few days after the rainfall event. The reduced daytime heat storage and the subsequent sensible heat flux result in a later negative Tn anomaly. The effect of rainfall variations on temperature is significant for long-term warming trends. The rainfall decrease experienced between 1959 and 2008 accounts for a rainy season Tx increase of 0.15 to 0.3 A degrees C, out of a total Tx increase of 1.3 to 1.5 A degrees C. These results have strong implications on the assessment of future temperature changes. The dampening or amplifying effects of precipitation are determined by the sign of future precipitation trends. Confidence on temperature changes under global warming partly depend on the robustness of precipitation projections. |
英文关键词 | Rainfall Temperature Climate change Trends Sahel Burkina Faso |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000425328700019 |
WOS关键词 | SOIL-MOISTURE ; CLIMATE-CHANGE ; SURFACE-TEMPERATURE ; LAND-SURFACE ; HEAT WAVES ; EXTREMES ; IMPACT ; PROJECTIONS ; FEEDBACKS ; ENSEMBLE |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35574 |
专题 | 气候变化 |
作者单位 | 1.Univ Bourgogne Franche Comte, CNRS, UMR 6282, Ctr Rech Climatol Biogeosci, F-21000 Dijon, France; 2.ASECNA, CP 806, Bissau, Guinea Bissau |
推荐引用方式 GB/T 7714 | Oueslati, Boutheina,Camberlin, Pierre,Zoungrana, Joel,et al. Variability and trends of wet season temperature in the Sudano-Sahelian zone and relationships with precipitation[J]. CLIMATE DYNAMICS,2018,50:1067-1090. |
APA | Oueslati, Boutheina,Camberlin, Pierre,Zoungrana, Joel,Roucou, Pascal,&Diallo, Saliou.(2018).Variability and trends of wet season temperature in the Sudano-Sahelian zone and relationships with precipitation.CLIMATE DYNAMICS,50,1067-1090. |
MLA | Oueslati, Boutheina,et al."Variability and trends of wet season temperature in the Sudano-Sahelian zone and relationships with precipitation".CLIMATE DYNAMICS 50(2018):1067-1090. |
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